21655363034343 has 4 divisors (see below), whose sum is σ = 28873817379128. Its totient is φ = 14436908689560.

The previous prime is 21655363034321. The next prime is 21655363034351. The reversal of 21655363034343 is 34343036355612.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21655363034343 - 2⁸ = 21655363034087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21655363034292 and 21655363034301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655363034243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3609227172388 + ... + 3609227172393.

It is an arithmetic number, because the mean of its divisors is an integer number (7218454344782).

Almost surely, 2^{21655363034343} is an apocalyptic number.

21655363034343 is a deficient number, since it is larger than the sum of its proper divisors (7218454344785).

21655363034343 is an equidigital number, since it uses as much as digits as its factorization.

21655363034343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7218454344784.

The product of its (nonzero) digits is 6998400, while the sum is 48.

Adding to 21655363034343 its reverse (34343036355612), we get a palindrome (55998399389955).

The spelling of 21655363034343 in words is "twenty-one trillion, six hundred fifty-five billion, three hundred sixty-three million, thirty-four thousand, three hundred forty-three".